Applying CSS to select a different element style within a webpage

I was thinking about the possibility of linking one style to another using events like :focus or :hover in CSS alone, without the need for JavaScript.

For instance, can the class "hitArea" change the background attribute of "changeArea" when it is in focus?

.changeArea { background: yellow; }
.hitArea div:focus { changeArea: changeBG; }
.changeArea changeBG { background: blue; }

While I am aware of communication between styles during CSS animations, as shown in this working example:

.reveal {
    position: absolute;
    top: 190px;
    left: 0px;
    margin-left: 0px;

    -webkit-animation-name: reveal;
    -webkit-animation-duration: 0.1s;
    -webkit-animation-fill-mode: backwards;
    -webkit-animation-delay: 0.2s;

    animation-name: reveal;
    animation-duration: 0.1s;
    animation-fill-mode: backwards;
    animation-delay: 0.2s;
}

@-webkit-keyframes reveal {
    0% { left: -900px; -webkit-animation-timing-function: linear; }
    99% { left: -900px; -webkit-animation-timing-function: linear; }
    100% { left: 0px; }
}

I'm curious about the syntax and whether it's possible to establish communication between other styles.

Answer №1

Suppose your HTML code appears like this:

<div class="hitarea">
    <div class="changeArea"></div>
</div>

In that case, you can style changeArea when hitArea is focused using the following CSS selector:

.hitarea:focus .changeArea {
    background-color: red;
}

This approach only applies when "changeArea" is a descendant of hitarea.

Explore more about CSS Selectors and their capabilities here: https://developer.mozilla.org/en-US/docs/CSS/Getting_Started/Selectors

Answer №2

It seems unlikely to me. Check out http://sass-lang.com/ for more information on how to achieve similar results.

Answer №3

Indeed, if .hitArea has a child called .changeArea, then it's a go!

.hitArea:focus .changeArea{ /* Custom styles for when .hitarea is hovered */ }

If this isn't the desired outcome, I suggest configuring it so that when .hitArea is focused, a JavaScript function can add a class to .changeArea with the required styles.

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